I'm staying with the free Avast! that the OP article sites.
They note in the article that "it's heavier than MSE, its interface is more overbearing, and it tries to upsell you to a paid product you don’t really need. But that’s the price we pay for solid antivirus protection"
All of which is true but as they also point out "average Windows users don’t always follow proper security practices and should use a strong antivirus that does well in tests" That would be both my wife and my Mother-in-Law, neither who could give a whit about computer security and/or practices...they just want to log on, surf and check their emails. (*Note: Bold in quote has been done by me and was not in the original article*)
And even though the interface can seem a bit busy, I've always been able to (over the phone) walk my Mother-in-Law through the interface and give me a code to log into/remote into her machine.
I've tried MSE, was a long time user of AVG, used Avira for quite awhile (until the Ask Toolbar came crashing in) but have been quite happy with the free Avast! for the past couple of years, the real time protection works pretty well and even though it is heavier on resources than MSE, I've tweaked a few elements of it so it's now purring along side-by-side of my MBAM and all is safe....at least for now, in the Winterland household of multiple workstations.